The Editorial Office of Frontiers in Plant Science would like to thank all the Chief Editors, Associate Editors and Review Editors that played an integral part in Frontiers’ innovative Collaborative Peer-Review process in 2020. In particular, we would like to recognize and thank Prof. Joshua L. Heazlewood – our now former Field Chief Editor, for his commitment, support and enthusiasm for the Plant Science field. Josh’s dedication and leadership has helped Frontiers in Plant Science become the most cited journal in the field with a strong editorial community. Looking forward, we’re excited to welcome Prof. Yunde Zhao, as our new Field Chief Editor in 2021. Having been with Frontiers in Plant Science since 2017, Yunde has contributed extensively to the development of the journal and will continue to ensure the journal goes from strength to strength.

Melatonin (N-acetyl-5-methoxytryptamine) is a widely studied biomolecule, and its function has been investigated in bacteria, mammals, birds, amphibians, reptiles, fish and plants. Melatonin research in plants the last five years has attained an exponential growth phase and the number of publications related to phytomelatonin has significantly increased in present times. All this research is directed towards establishing multifarious roles of melatonin in plants, including the promotion of seed germination and seedling growth, influencing plant development and senescence, alteration of flowering and fruiting time and grain yield, modulating circadian rhythms, improving resistance against biotic stress as well as tolerance to abiotic stress, reducing oxidative stress, and stimulating plant immune response. However, to date, an exhaustive book, solely and exclusively dedicated to melatonin research on various aspects of plant biology, has not been published by any renowned publisher or is available in the market. Keeping all these facts in mind, this book aims to compile the most recent developments in the arena of melatonin-mediated regulation of plant physiology under optimal and sub-optimal conditions. This book will initiate and introduce the readers to the state-of-the-art developments and trends in this field of study and will largely cater to the scientific need of scientists engaged in melatonin research across the globe. The book will be unique of its kind and will draw the attention of scientific and research communities engaged in the field of melatonin research. The key features of this book: Authors will address the topics which would provide advances in the understanding of diverse functions of melatonin in plants, encompassing almost all the aspects that have been investigated so far Integrate the overall mechanistic function of melatonin, genomics and proteomics tools, and genetic engineering to manipulate endogenous melatonin levels, thus giving a holistic view of plant-level studies under normal or challenging situations Largely help the readers to design future research programs in exploiting melatonin as a protective agent to develop climate-resilient and pathogen-resistant plants Benefit the crop protection program and ensure food security Chapters will be supplemented with ample illustrations and figures This book will be beneficial to research scholars and Ph.D. students involved in melatonin research and working on stress physiology, stress proteins, genomics, proteomics and genetic engineering in different universities and research institutes all over the world. The book can also be used as an advanced reference book for the coursework of research and master’s level students. It will be of use to people involved in improving plant growth and yield, as well as the performance of plant species in the face of climate change and pathogen infection, using melatonin as the prime protective agent and signaling molecule. Although the book will directly benefit the academic and scientific community, it will also indirectly draw the attention of industries or companies that manufacture or sell chemical products, since the book will highlight in detail the antioxidative potential of melatonin. This will create impetus at the industrial level for the isolation and synthesis of melatonin as a beneficial chemical agent. Applying melatonin as an ameliorating agent against different stresses at the field level will also increase the demand for this chemical among the farmers and will promote large-scale sales and utilization of melatonin for ensuring crop protection and increasing yield.

MANAGING PLANT STRESS USING SALICYLIC ACID Enables readers to understand the ability of salicylic acid in reducing the effects of abiotic stresses in different crop species Salicylic acid is an important plant hormone which acts as a multifunctional molecule and regulates key physiological and biochemical processes in plants. This book highlights the tremendous potential of treating plants with salicylic acid, either prior to or during stress. It focuses on the specific challenges and opportunities related to exogenous application or priming technology, such as the mode of application, new methodologies, and the potential impacts of salicylic acid on the environment. Sample topics covered in the book include: The latest research on the ability of salicylic acid in reducing the effects of abiotic stresses in different crop species The mechanism of action of salicylic acid at the biochemical and molecular level Salicylic acid and its crosstalk with other plant hormones under stressful environments Regulation of abiotic stress by salicylic acid at the gene level The role of salicylic acid on the postharvest physiology of plants This book will be of significant interest to researchers, academics, and scientists working in the field of salicylic acid mediated responses in plants under challenging environments and with abiotic stress tolerance.

Global climate change has created unprecedented challenges for human civilization due to its widespread adverse consequences, including a reduction in crop yield and threatening food security across the globe. Among the crop plants, legumes have great potential for ameliorating global warming since they can reduce carbon emissions by lowering reliance on the application of chemical fertilizers, by increasing nitrification and carbon sequestration in soil, and by providing protein-rich diets to both humans and livestock. This book identifies the extent of climate-induced stresses on legume plants and focuses on achieving food security through sustainable agricultural practices. This book compiles recent research findings and reviews on climate-related problems, the potential of legumes in ameliorating the impacts of climate change, as well as better management of agricultural land and practices for achieving environmental sustainability and food security. This book will serve as guidelines for scientists, agricultural practitioners, and policymakers working to achieve food security and better management of climate-induced stresses in agricultural interventions. It will also be useful as a reference book for researchers and students of both graduate and postgraduate levels. Furthermore, this book will provide enhanced knowledge about the mechanisms of yield and stress tolerance of legumes as well as developing climate-smart crops and improving cropping systems for a sustainable environment and food security. Features of the book Reviews trends of global climate change and its consequences for food security across the continents Identifies the challenges and scopes of cultivating legumes in achieving food security in the context of global climate change Focuses on the improvements of legume production through conservation approaches in agricultural practices and modern techniques, including omics-based breeding, biotechnology, genetic engineering, and rhizobium technology Discusses the sustainable amelioration options for soils affected by climate-induced stresses Cites examples of applications of rhizobium technologies in reducing greenhouse gas emission Describes pathways associated with yield, resistance, and tolerance of legumes to climate-induced stresses